def debase26(x):
	return sum(26 ** i * (ord(d) - ord('A') + 1) for i, d in enumerate(x[::-1]))


def base26(x):
  L = []
  while True:
    x, d = divmod(x, 26)
    if d == 0: break
    L.append(d)
  return ''.join(chr(x + ord('A') - 1) for x in L[::-1])

if __name__ == '__main__':
  result = debase26('COOLSHELL') // debase26('SHELL')
  print(base26(result))